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East Portal Diversion Dam

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When water is diverted from Colorado's West Slope through the Alva B. Adams Tunnel to Colorado's East Slope, it is first deposited in East Portal, a small afterbay enclosed by East Portal Dam. East Portal sits to the southwest of Estes Park, Colorado on the boundary of Rocky Mountain National Park.

Water can exit East Portal through the spillway, depositing into Wind River, but it is almost always diverted via the Rams Horn Tunnel to Marys Lake and the Marys Lake Power Plant.


Last updated: Mar 29, 2013